C20H12O5

C20H12O5 is the molecular formula of compounds that contain 20 carbon atoms, 12 hydrogen atoms, and 5 oxygen atoms. This formula does not specify a unique structure; many structural isomers satisfy it, typically polycyclic aromatic frameworks with oxygen-containing functional groups.

Within the class of C20H12O5 isomers, structures often feature polycyclic aromatic cores bearing carbonyl groups (such as ketones or quinones), ethers, esters, or lactone and anhydride functionalities. The exact arrangement of rings and substituents determines the chemical and physical properties, so properties vary across isomers. The calculated molar mass is about 332.31 g/mol.

The formula occurs in chemical databases and analytical contexts as a possible composition for oxidation products of larger aromatic systems or as a target in mass spectrometric identification, and may appear in studies of environmental chemistry, materials science, or organic synthesis.

Because there is no single structure defined by the formula, toxicity, solubility, and reactivity depend on the specific isomer. As with many oxygenated polycyclic aromatics, some isomers can be persistent in the environment and may pose health or ecological risks; appropriate handling and risk assessment apply to the specific compound.